First, nowadays, F2 is the more common key for getting to the bios although some do use the Del key for this purpose.
2nd, for a one time boot order change, nowadays, most bioses will recognize F12 and give you a choice of the boot device.
3rd, You will need to prepare a System Repair Disc on a Win 7 system.
4th. boot from the System Repair Disc
Don't worry about it having been prepared on a win 7 system. All you want to do is use it to run diskpart.
5th. run the diskpart sequence to clean all. Do NOT partition, do NOT mark active or anything else.
Remove the system repair disc, insert the xp disc and shutdown your system. Now boot up from the XP disc.
What you've done is made the disk look like a virgin disk.
To make a system repair disc on your win 7 system: |
type Repair Disc | ENTER
you will be prompted to insert a CD/DVD
Either a CD or a DVD may be used.